8–13 Sept 2019
Europe/Rome timezone
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Hot gas heating via magnetic arms in spiral galaxies?

13 Sept 2019, 14:52
2m

Speaker

Dr Matthias Ehle (ESA-ESAC)

Description

In some spiral galaxies the so-called "magnetic arms" have been reported, being interarm areas with significant polarized radio emission that suggests high ordering of the magnetic field. The most prominent example of such a galaxy is NGC 6946.
The nature of these magnetic features is still under debate. One of the possible explanations is the action of reconnection heating that could convert the energy of the magnetic field into thermal energy of the surrounding gas.
We summarize the analysis of the radio and X-ray emission (measured with XMM-Newton) from NGC 6946 and conclude that we might see hints for such reconnection heating (cf. Wezgowiec et al. A&A 585, 3, 2016). A similar analysis is on-going for further galaxies: For one of them, M83, we intend to present preliminary results.

Affiliation ESA-ESAC
Topic Compact and diffuse sources in galaxies and in the Galactic Center

Primary authors

Dr Matthias Ehle (ESA-ESAC) Dr Marek Wezgowiec (Obserwatorium Astronomiczne Uniwersytetu Jagiellonskiego, Krakow)

Co-authors

Dr Rainer Beck (MPIfR Bonn) Dr Marian Soida (Obserwatorium Astronomiczne Uniwersytetu Jagiellonskiego, Krakow) Dr Marek Urbanik (Obserwatorium Astronomiczne Uniwersytetu Jagiellonskiego, Krakow)

Presentation materials